The Greenland birds agree with those from North America in not 

 being quite so thickly feathered on the toes. I think it likely that 

 an error in the sex has occurred in the two Lichtenfels examples. 

 But little reliance can be placed on the tarsal measurements, owing 

 to the extreme density of the feathers, which renders it almost im- 

 possible to obtain the exact dimensions. 



Hub. The same as that of the genus. 



Unst, Shetland Isles. 



Orkneys. 



N. Europe. 



Icy Cape, Norway. 



Icy Cape, Norway. 



Upland, Sweden, Nov. 18, 



1872. 

 Upland, Sweden, Jan. 7, 1 872. 

 Upland, Sweden, Jan. 10, 



1872. 

 Archangel. 

 Lichtenfels, S. Greenland, 



_ Feb. 27, 1874. 

 Lichtenfels, S. Greenland, 



June 8, 1871. 

 Labrador. 



Hudson's-Bay Ten-itoiy. 

 Hudson's-Bay Territory. 

 Fort Simpson, Jan. 15, 1862. 

 Arctic America. 



Mr. Bullock. 



Zoological Society. 



H. D. Woodfull, Esq. [P.]. 



H. D. Woodfull, Esq. [P.]. 



Pm-chased. 



Purchased. 

 Purchased. 



E. B. Sharpe, Esq. [P.]. 

 R. B. Sharpe, Esq. [P. J. 



E. B. Sharpe, Esq. [P.]. 



Eev. Mr. Eeichel [P.]. 

 Hudson's-Bay Co. [P.]. 

 Hudsons-Bav Co. [P.]. 

 B. E. Eoss, Esq. [P.]. 

 Admiral Sir G. Back [P.]. 



